batgrbproduct Analysis for Trigger=150532
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.41
Process Start Time (local time): Tue Jan 8 16:29:36 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger150532/SDC
======================================================================
Trigger: 00150532 Segment: 000
BAT Trigger Time: 145819518.4 [s; MET]
Trigger Stop: 145819520.448 [s; MET]
UTC: 2005-08-15T17:25:18.723840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 293.574656755954 Dec: 9.16636481502104 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.78
Image Trigger?: NO
Rate S/N Ratio: 12.6095202129185 [ if not an image trigger ]
Image S/N Ratio: 8.78
Flight Position: [ source = BAT ]
RA: 293.574656755954 Dec: 9.16636481502104 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 293.572801467855 Dec: 9.16454911648469 [deg; J2000]
{ 19h 34m 17.5s , +09d 09' 52.4" }
+/- 2.19275953752556 [arcmin] (estimated 90% radius based on SNR)
+/- 1.18599537944897 [arcmin] (formal 1-sigma fit error)
SNR: 9.90805406216357
RA = 19h 34m 17.5s (293.572801 deg.)
Dec = 9d 9' 52" (9.164549 deg.)
Angular difference between Flight and Ground position is 0.154743 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 8 +/- 4.12310562561766
Measured from: -0.400000005960464
to: 7.59999999403954 [s; relative to TRIGTIME]
T50: 3 +/- 2.23606797749979
Measured from: 0.599999994039536
to: 3.59999999403954 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.599999994039536
to: 1.59999999403954 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.400000005960464
to: 9.59999999403954 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.091732 0.109156 0.049026 0.018340
0.016049 0.015594 0.013225 0.011097 [error]
Peak 0.022175 0.026007 0.008591 0.005850
0.005197 0.005281 0.004418 0.003484 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 2.26e-08 3.77e-08 4.75e-08 1.19e-07 1.41e-07 2.29e-07 erg/cm2
Error 6.05e-09 6.80e-09 1.21e-08 6.16e-08 2.92e-08 7.35e-08 erg/cm2
Peak flux Power-law 2.05e-01 1.50e-01 7.27e-02 4.99e-02 4.52e-01 4.78e-01 ph/cm2/s
Error 6.85e-02 4.01e-02 3.21e-02 4.07e-02 1.18e-01 1.28e-01 ph/cm2/s
Fluence Cutoff-PL 1.93e-08 4.85e-08 3.99e-08 6.60e-09 1.14e-07 1.14e-07 erg/cm2
Error 6.96e-09 1.07e-08 1.81e-08 2.47e-08 2.42e-08 3.95e-08 erg/cm2
Peak flux Cutoff-PL 1.70e-01 2.03e-01 6.06e-02 2.55e-03 4.37e-01 4.37e-01 ph/cm2/s
Error 7.94e-02 6.04e-02 4.17e-02 1.55e-02 1.15e-01 1.16e-01 ph/cm2/s
Fluence Band 1.89e-08 4.88e-08 3.96e-08 2.91e-08 1.21e-07 1.36e-07 erg/cm2
Error 6.71e-09 9.51e-09 1.37e-08 5.33e-08 2.98e-08 7.10e-08 erg/cm2
Peak flux Band 1.72e-01 2.00e-01 6.36e-02 3.42e-03 4.35e-01 4.49e-01 ph/cm2/s
Error 5.13e-02 4.99e-02 2.61e-02 1.62e-02 1.09e-01 1.16e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.666 0.297 - - 1.52e-03 2.97e-04 80.715 57
CPL -0.583 2.074 46.2 18.6 3.18e-02 2.57e-01 75.328 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.045 0.462 - - 2.95e-03 1.02e-03 48.629 57
CPL -0.572 2.316 37.9 11.1 1.13e-01 1.11e+00 44.435 0
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 10.000 -0.400 9.600
T90 8.000 -0.400 7.600
T50 3.000 0.600 3.600
Peak 1.000 0.600 1.600
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
293.5728 +9.1645 0.0194 8.2 31.7 0.2919 9.9 TRIG_00150532
------------------------------------------
Foreground time interval of the image:
-0.400 9.600 (delta_t = 10.000 [sec])
Background time interval of the image:
-299.400 -0.400 (delta_t = 299.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.400 sec. to 9.600 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66631 ( -0.292760 0.300405 )
Norm@50keV : 1.521202E-03 ( -2.991462E-04 2.947077E-04) )
------------------------------------------------------------
Chi-Squared = 80.71526 using 59 PHA bins.
Reduced chi-squared = 1.416057 for 57 degrees of freedom
Null hypothesis probability = 2.108E-02
Photon flux (15-150 keV) in 10.00 sec: 0.199714 ( -0.035993 0.036034 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41247e-07 ( -2.8795e-08 2.966e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.400 sec. to 9.600 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.582958 ( -2.41704 1.73187 )
Epeak [keV] : 46.2421 ( -9.25033 27.9280 )
Norm@50keV : 3.178604E-02 ( -3.178604E-02 0.481973 )
------------------------------------------------------------
Chi-Squared = 75.32832 using 59 PHA bins.
Reduced chi-squared = 1.345148 for 56 degrees of freedom
Null hypothesis probability = 4.346E-02
Photon flux (15-150 keV) in 10.00 sec: 0.187042 ( -0.036208 0.01853 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13569e-07 ( -1.45553e-08 3.3845e-08 ) ergs/cm2
Band function
Time interval is from -0.400 sec. to 9.600 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.465500 ( -1.45546 3.77199 )
beta : -2.89591 ( -7.10409 1.18541 )
Epeak [keV] : 45.3324 ( -4.09766 33.9607 )
Norm@50keV : 2.862342E-02 ( -25.9666 6.01934 )
------------------------------------------------------------
Chi-Squared = 74.72620 using 59 PHA bins.
Reduced chi-squared = 1.358658 for 55 degrees of freedom
Null hypothesis probability = 3.957E-02
Photon flux (15-150 keV) in 10.00 sec: 0.191346 ( -0.035283 0.036265 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21125e-07 ( -2.17732e-08 3.7729e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.600 sec. to 1.600 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04460 ( -0.427328 0.497134 )
Norm@50keV : 2.948131E-03 ( -1.029499E-03 1.004934E-03) )
------------------------------------------------------------
Chi-Squared = 48.62860 using 59 PHA bins.
Reduced chi-squared = 0.8531333 for 57 degrees of freedom
Null hypothesis probability = 0.777
Photon flux (15-150 keV) in 1.000 sec: 0.451543 ( -0.118415 0.118473 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.7269e-08 ( -8.5654e-09 9.1159e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.600 sec. to 1.600 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.572347 ( -2.42765 2.20456 )
Epeak [keV] : 37.9392 ( -5.83106 16.3526 )
Norm@50keV : 0.113400 ( -0.113400 2.09675 )
------------------------------------------------------------
Chi-Squared = 44.43456 using 59 PHA bins.
but latest trial 26.5261 gives Chi-Squared = 2.83955
Reduced chi-squared = 0.7934743 for 56 degrees of freedom
Null hypothesis probability = 0.867
Photon flux (15-150 keV) in 1.000 sec: 0.436788 ( -0.113598 0.116319 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.34036e-08 ( -6.9006e-09 8.3737e-09 ) ergs/cm2
Band function
Time interval is from 0.600 sec. to 1.600 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.230291 ( -2.82149 4.22860 )
beta : -8.98226 ( -1.01774 18.9821 )
Epeak [keV] : 38.5848 ( -26.7749 21.8818 )
Norm@50keV : 6.885001E-02 ( -2.011169E-02 284.858 )
------------------------------------------------------------
Chi-Squared = 44.53251 using 59 PHA bins.
Reduced chi-squared = 0.8096819 for 55 degrees of freedom
Null hypothesis probability = 0.842
Photon flux (15-150 keV) in 1.000 sec: 0.434979 ( -0.108644 0.109122 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38209e-08 ( -5.9428e-09 5.9837e-09 ) ergs/cm2
Plot creation:
Tue Jan 8 16:37:47 EST 2008